Hot-blast stove.



Patented Dec. 2, I902,

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B. YOUNG.

HOT BLAST STDVE. (Application filed. Mar. 26, 1902.)

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UNITED STATES PATENT OFFICE.

ROBERT YOUNG, or TACOMA, .WASHINGTON.

HOT-BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 715,188, dated December 2, 1902.

Application filed March 26, 1902.

To (til whom it may concern:

Be it known that I, ROBERT YOUNG, a citizen of the UnitedStates, residing at Tacoma, in the county of Pierce and State of Washington, have invented new and useful Improvements in Hot-Blast Stoves, of which the following is a specification.

My invention relates to regenerative h'ot blast stoves, the object of the same being to provide means whereby hydrogen gas may be generated therein to mix with the heated air, and thereby produce a hydro-oxygen hot blast for delivery into a furnace.

The invention consists in the provision of. a mass of refractory metallic substance in the stove and means for introducing high-pressure steam into the stove into contact with said metallic substance, whereby the steam is decomposed by the refractory metallic substance setting free hydrogen gas, which mixes with the heated air pas'singthrough the stove.

The invention also consists in certain fea tures and details of construction, which will be hereinafter more fully described and claimed.

In order that my invention may be more fully understood, I have illustrated in the accompanying drawings one embodiment thereof, which I will now proceed to describe in detail.

In said drawings, Figure 1 is an elevation, partly in section, of a hot-blast stove embodying my improvements; and Fig. 2 is a horizontal section taken partly through the brick checker-work and partly through the mass of refractory metallic substance above the same.

Like reference-numerals refer to like parts in the different views.

The casing 1 of the stove, which has been shown as cylindrical in form, but which may be of any other suitable shape, has a vertical partition 2 therein extending from the bottom to a short distance from the top, forming the vertical uptake-flue 'or combustionchamber 3 and the regenerative chamber 4. Leading into the combustion-chamber 3,at a point near the lower end thereof, is a valved gas-inlet pipe 5, and also leading into said combustion-chamber at one or more points are the valved air-inlets 6. Leading from blast air-inlet passages 11.

Serial No. 100,120. (No model.)

the combustion-chamber 3, preferably at a point near its lower end, is the valved discharge pipe or fine 7, which communicates with the furnace and is designed for the escape of thehydro-oxygen hot blast. Located wiihi n the regenerative chamber 4 and extending from the bottom thereof toa point adjacent to the upper end of the partition 2 is a massofgbrick checker-work 8, which it is common to employ in this class of devices. Above the brick checker-work Sis located a mass 9 ofmetallic refractory material. The refractory metallic material which I prefer to use and which I have found most satisfactory in use is pig-iron; but it is obvious that other metallic substances of asimilar nature may be substituted therefor. Leading from the lower end of the regenerative chamber 4 is a valved chimney-flue 10, and communicating with the lower end of said regenerative chamber are one or more valved cold- Leading into the regenerative chamber 4, at a point a short distance below the mass 9 of refractory metallicmaterial, is a steam-pipe 12, the same being itself perforated for the discharge of steam and being provided with perforated lateral branches l3 and 14. The steam-pipe 12 extendsvertically along the outside of the casino; 1, is provided with a controlling-valve l5, and communicates with a main horizontal steam-supply pipe 16. The said pipe 16 extends alongthe sides of a series of hotblast stoves similar to that illustrated-herein,

the same being designed for supplying each of said stoves with steam.

To heat the stove, and particularly to heat the mass 9 of refractory metallic material and the brick checker-work 8 in the regenerative chamber 4, the valve 15 and the valves ofthe cold-blast inlet 11 and of the hot-blastexitflue 7 are closed and the valves of the gasinlet pipe 5, the air-inlet 6, and the-chimneyflue 10 are opened. The gas enteringthrough the inlet 5 is ignited within the chamber 3, and air to support combustion is admitted through the air-inlets 6. This gas burning in the combustion-chamber 3passes upwardly around the bridge-wall formed by the upper edge of the partition 2 and thence downwardly through the regenerative chamber 4 and 05 to the atmosphere through the chimney-fine 10. The products of combustion raise the refractory metallic substance 9 and the brick checker-work S in the regenerative chamber 4 to a high degree of heat. When these parts are sufficiently heated, the valves in the gasinlet 5, in the air-inlets 6, and in the chimney-flue 10 are closed and the cold-blast valve 1.1 and the hot-blast discharge-flue 7 opened. The steam-valve 15 is also opened; but it is preferable to allow the cold-air blast entering through the air-inlet 11 to pass through the stove for a short period of time before the steam-valve 15 is opened in order that any unconsumed gases may be carried off through the discharge-flue 7 and the danger of explosion obviated. When the valve 15 is open, high-pressu re steam is caused to pass through the pipe 12 and the branches 13 and 14 thereof into the regenerative chamber 4 beneath the mass 9 of refractory metallic material. As the same rises it is brought in contact with the metallic substance 9 and is decomposed thereby. \Vhen pig-iron is used as the refractory metallic substance, oxid of iron is formed and hydrogen is set free. This hydrogen mixing with the hot air passes down through the combustion-chamber 3 and off to the furnace through the discharge-flue 7 in the form of a hydrooxygen hot blast.

Ihave shown and described the steam-pipe 12 as entering the regenerative chamber 4 and discharging at a point just below the mass 9 of refractory metallic material. I prefor this disposition of parts; but it is obvious that said steam-pipe may enter the regenerative chamber 4 at any other suitable point. I have also shown the mass 9 of refractory metallic material as located at the upper end of the brick checker-work 8 in the regenerative chamber 4, this location being preferred on account of the fact that it is the hottest in the stove and is farthest removed from the cold-blast inlet 11. The metallic refractory substance 9 therefore is raised to the highest possible degree of heat by the combustion of the gas in the combustion-chamber 3, and on account of its location the blast of air from the air-inlet 11 has an opportunity to become heated beforereaching the same. The said mass of refractory metallic substance therefore will be heated to agreater extent and will retain its heat for a greater length of time than if otherwise disposed. I do not limit myself, however, to the exact location of this mass of metallic substance. By providing the valve 15 in the steam-pipe 12 it is obvious that the volume of hydrogen generated may be accurately controlledthat is to say, by opening or closing the valve 15 to a greater or less extent, a greater or less quantity of high-pressure steam will be admitted to the stove and a greater or less vol- 11 me of hydrogen gas will be generated.

It will beobserved from the foregoing description that my invention can be applied to any old form of hot-blast stove and when so applied will operate'in a satisfactory manner for the production of a hydro -oxygen blast for supply to a furnace.

Having now described my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. Inahot-blaststove,acasinghaving brick checker-work therein, means for highly heating said checker-Work, means for passing steam therethrough and means therein for decomposing said steam.

2. In a hot-blast stove,a casing having brick checker-Work therein, means for highly heating said checkerwork, means for passing steam therethrough and means therein for automatically decomposing said steam.

3. In ahot-blaststove,acasinghavingbrick checker-work therein, means for highly heating said checker-Work, means for passing steam therethrough, means therein for decomposing said steam and means for regulating the supply of steam.

4. In a hot-blaststove,a casing having brick checker-Work therein, means for highly heating said checker-work, means for passing steam therethrough and a mass of refractory metallic substance therein for decomposing said steam.

5. In a hot-blast stove,a casing having brick checker-work therein, means for highly heating said checker-Work, means for passing steam therethrough, a mass of refractory metallic substance therein for decomposing said steam and means for regulating the supply of steam.

6. In a hot-blast stove,a casing having brick checker-work therein, means for passing hot gases therethrough for heating said checkerwork, means for cutting off the supply of hot gases, means for passing-steam therethrough and means therein for decomposing said steam.

7. Inahot-blast stove,acasinghavingbrick checker-Work therein, means for passing hot gases therethrough for heating said checkerwork, means for cutting 01f the supply of hot gases, means for passing steam therethrough and a mass of refractory metallic substance above said checkerwork for decomposing said steam.

8. A hot-blast stove, comprising a casing having a partition therein dividing the same into a combustion-chamber and regenerative chamber, which chambers communicate with each other at their upper ends, valved gas and air inlets leading into said combustionchamber, and a hot-blast outlet leading therefrom,brick checker-work in said regenerative chamber terminating a short distance from the upper end thereof, a mass of refractory metallic substance located above said checker- Work, a valved chimney-flue leading from the lower part of said regenerative chamber, a valved cold-air inlet leading into said regenerative chamber, and a steam-pipe communieating with the interior of said regenerative chamber below the mass of refractory metallic substance therein.

9. A hot-blast stove, comprising a casing having a partition therein dividing the same into a combustion-chamber and regenerative chamber, which chambers communicate with each other at their upper ends, valved gas and air inlets leading into said combustionchamber, and a hot-blast outlet leading theref rom,brick checker-work in said regenerative chamber terminating a short distance from the upper end thereof, a mass of refractory metallic substance located above said checkerwork, a valved chi mney-fiue leading from the lower part of said regenerative chamber, a valved cold-air inlet leading into said regenerative chamber, a steam-pipe leading into said regenerative chamber and disehargin g at a point below the mass of refractory substance therein, and a valve in said pipe for controlling the supply of steam.

10. A hot-blast stove, comprising a casing having a partition therein dividing the same into a combustion-chamber and regenerative chamber, which chambers communicate with each other at their upper ends, valved gas the mass of refractory metallic substance in 4 said regenerative chamber.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ROBERT YOUNG.

Witnesses:

G. UZAFORAGE, 0. E. PETERSON. 

